This article presents the theoretical and methodological aspects of the activist science and technology education practices of a Brazilian outreach initiative known as Science Stand. This learn-by-doing program is designed to connect science and technology to current global socio-ecological issues – such as animal rights, gender (in)equality, and climate change – through interactive activities created and performed by university students in public spaces located in marginalized communities in the Greater São Paulo Area (Brazil). In addition, we introduce several testimonies from project volunteers that support our argument concerning the role of science activism in advocating gender equity in science, fostering hope in the possibility of socio-ecological change, and promoting the democratization of science through widespread knowledge dissemination.